Question

I am trying to get the Width of a StackPanel. I tried:

double width = stk_main.ActualWidth;

which gave zero and it shouldnt be. Also:

double width = stk_main.Width;

which gives NaN because width set to auto previously. So how can I get the width?

Answer 1

You can use sizeChanged, but it doesn’t work when the stack panel you used not change size.

private void stk_main_SizeChanged(object sender, SizeChangedEventArgs e)
{
    double yourWidthNow = e.NewSize.Width;
}

Hope it can give you some help…